diff options
Diffstat (limited to 'arch/arm/mach-tegra/iovmm-smmu.c')
| -rw-r--r-- | arch/arm/mach-tegra/iovmm-smmu.c | 29 |
1 files changed, 27 insertions, 2 deletions
diff --git a/arch/arm/mach-tegra/iovmm-smmu.c b/arch/arm/mach-tegra/iovmm-smmu.c index 021906b99bfb..ceb9a5ad803e 100644 --- a/arch/arm/mach-tegra/iovmm-smmu.c +++ b/arch/arm/mach-tegra/iovmm-smmu.c @@ -30,6 +30,7 @@ #include <linux/pagemap.h> #include <linux/sysfs.h> #include <linux/device.h> +#include <linux/sched.h> #include <asm/io.h> #include <asm/cacheflush.h> #include <asm/page.h> @@ -329,6 +330,7 @@ struct smmu_device { unsigned long lowest_asid; /* Variables for hardware testing */ unsigned long debug_asid; unsigned long verbose; + unsigned long signature_pid; /* For debugging aid */ }; #define VA_PAGE_TO_PA(va, page) \ @@ -583,6 +585,21 @@ static smmu_pte_t *locate_pte(struct smmu_as *as, return &ptbl[ptn % SMMU_PTBL_COUNT]; } +static void put_signature(struct smmu_as *as, + unsigned long addr, unsigned long pfn) +{ + if (as->smmu->signature_pid == current->pid) { + struct page *page = pfn_to_page(pfn); + unsigned long *vaddr = kmap(page); + if (vaddr) { + vaddr[0] = addr; + vaddr[1] = pfn << PAGE_SHIFT; + FLUSH_CPU_DCACHE(vaddr, page, sizeof(vaddr[0]) * 2); + kunmap(page); + } + } +} + static int smmu_map(struct tegra_iovmm_domain *domain, struct tegra_iovmm_area *iovma) { @@ -624,6 +641,7 @@ static int smmu_map(struct tegra_iovmm_domain *domain, flush_ptc_and_tlb(as->smmu, as, addr, pte, ptpage, 0); kunmap(ptpage); up(&as->sem); + put_signature(as, addr, pfn); addr += SMMU_PAGE_SIZE; } return 0; @@ -719,6 +737,7 @@ static void smmu_map_pfn(struct tegra_iovmm_domain *domain, FLUSH_CPU_DCACHE(pte, ptpage, sizeof *pte); flush_ptc_and_tlb(smmu, as, addr, pte, ptpage, 0); kunmap(ptpage); + put_signature(as, addr, pfn); } up(&as->sem); } @@ -1211,11 +1230,10 @@ static ssize_t _sysfs_show_##name(struct device *d, \ return rv; \ } -#ifdef CONFIG_TEGRA_SMMU_SYSFS static void (*_sysfs_null_callback)(struct smmu_device *, unsigned long *) = NULL; -#define _SYSFS_SET_VALUE(name, field, base, ceil, callback) \ +#define _SYSFS_SET_VALUE_DO(name, field, base, ceil, callback) \ static ssize_t _sysfs_set_##name(struct device *d, \ struct device_attribute *da, const char *buf, size_t count) \ { \ @@ -1229,6 +1247,8 @@ static ssize_t _sysfs_set_##name(struct device *d, \ } \ return count; \ } +#ifdef CONFIG_TEGRA_SMMU_SYSFS +#define _SYSFS_SET_VALUE _SYSFS_SET_VALUE_DO #else #define _SYSFS_SET_VALUE(name, field, base, ceil, callback) \ static ssize_t _sysfs_set_##name(struct device *d, \ @@ -1246,6 +1266,9 @@ _SYSFS_SET_VALUE(debug_asid, debug_asid, 10, MC_SMMU_NUM_ASIDS, _sysfs_null_callback) _SYSFS_SHOW_VALUE(verbose, verbose, "%lu") _SYSFS_SET_VALUE(verbose, verbose, 10, 3, _sysfs_null_callback) +_SYSFS_SHOW_VALUE(signature_pid, signature_pid, "%lu") +_SYSFS_SET_VALUE_DO(signature_pid, signature_pid, 10, PID_MAX_LIMIT+1, + _sysfs_null_callback) #ifdef CONFIG_TEGRA_SMMU_SYSFS static void _sysfs_mask_attr(struct smmu_device *smmu, unsigned long *field) @@ -1291,6 +1314,8 @@ static struct device_attribute _attr_values[] = { _sysfs_show_debug_asid, _sysfs_set_debug_asid), __ATTR(verbose, S_IRUGO|S_IWUSR, _sysfs_show_verbose, _sysfs_set_verbose), + __ATTR(signature_pid, S_IRUGO|S_IWUSR, + _sysfs_show_signature_pid, _sysfs_set_signature_pid), __ATTR(pdir_attr, S_IRUGO|S_IWUSR, _sysfs_show_pdir_attr, _sysfs_set_pdir_attr), |